Optical Microbubble Measurements in the North Sea

Su, Ming‐Yang; Ling, S. C.; Cartmill, John

doi:10.1007/978-94-009-3017-9_16

Cited by 11 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Medwin [179], making acoustic observations in situ through examination of attenuation at various frequencies, suggests that there is a higher proportion of the much smaller bubbles. Medwin and Breitz [180] confirm that the peak in the size spectrum occurs at a radius of less than 30 μπι, and Su et al [ 181 ] suggest that the peak is around 20 μπι. Farmer and Vagle [66] deployed an upwardly-pointing four-frequency echo sounder (28, 50, 88 and 200 kHz) to investigate the bubble size distribution.…”

Section: (B) Bubble Counting In the Seamentioning

confidence: 94%

The Freely-oscillating Bubble

Leighton

1994

The Acoustic Bubble

View full text Add to dashboard Cite

Section: (B) Bubble Counting In the Seamentioning

confidence: 94%

The Freely-oscillating Bubble

Leighton

1994

The Acoustic Bubble

View full text Add to dashboard Cite

“…Past studies have used optical methods to resolve bubbles with radii as small as 10 μm [ Su et al ., ; O'Hern et al ., ], but such methods sample only small volumes of water (generally mm 3 to cm 3 ) and cannot easily resolve the spatial and temporal variability inherent to bubble plumes. One of the most frequently cited bubble data sets was acquired using a photographic method [ Johnson and Cooke , ].…”

Section: Introductionmentioning

confidence: 98%

Optical measurements of small deeply penetrating bubble populations generated by breaking waves in the Southern Ocean

Randolph

Dierssen

Twardowski³

et al. 2014

JGR Oceans

View full text Add to dashboard Cite

Bubble size distributions ranging from 0.5 to 125 lm radius were measured optically during high winds of 13 m s 21 and large-scale wave breaking as part of the Southern Ocean Gas Exchange Experiment.Very small bubbles with radii less than 60 mm were measured at 6-9 m depth using optical measurements of the near-forward volume scattering function and critical scattering angle for bubbles (80 ). The bubble size distributions generally followed a power law distribution with mean slope values ranging from 3.6 to 4.6. The steeper slopes measured here were consistent with what would be expected near the base of the bubble plume. Bubbles, likely stabilized with organic coatings, were present for time periods on the order of 10-100 s at depths of 6-9 m. Here, relatively young seas, with an inverse wave age of approximately 0.88 and shorter characteristic wave scales, produced lower bubble concentrations, shallower bubble penetration depths, and steep bubble size distribution slopes. Conversely, older seas, with an inverse wave age of 0.70 and longer characteristic wave scales, produced relatively higher bubble concentrations penetrating to 15 m depth, larger bubble sizes, and shallower bubble size distribution slopes. When extrapolated to 4 m depth using a previously published bubble size distribution, our estimates suggest that the deeply penetrating small bubbles measured in the Southern Ocean supplied 36% of the total void fraction and likely contributed to the transfer and supersaturation of low-solubility gases.

show abstract

“…Immediately after wave breaking, the newly created bubbles are typically of sizes 0.1 -10 mm (Deane, 1997;Haines and Johnson, 1995;Phelps et al, 1997;Zhang et al, 2002). Once bubble creation processes cease, the newly formed bubble plume evolves under the influence of turbulent diffusion, advection, buoyant degassing and dissolution, leaving behind a diffuse cloud of microbubbles (Baldy, 1988;Baldy and Bourguel, 1985;Breitz and Medwin, 1989;Cartmill and Su, 1993;Johnson and Cooke, 1979;Kolovayev, 1976;Leeuw and Cohen, 1995;Phelps and Leighton, 1998;Su and Cartmil, 1994;Su et al, 1988;Terrill et al, 2001;Farmer, 1992, 1998;Walsh and Mulhearn, 1987). Copious amounts of bubbles have also been observed in quiescent seas (Fig.…”

Section: Air Bubblesmentioning

confidence: 99%

“…Optics-based methods (solid lines in Fig. 8.27) include photography (Deane, 1997;Johnson and Cooke, 1979;Kolovayev, 1976;Leeuw and Cohen, 1995;Walsh and Mulhearn, 1987), light scattering and reflection (Baldy, 1988;Baldy and Bourguel, 1985;Ling and Pao, 1988;Su et al, 1988), andholography (O'Hern. et al, 1988).…”

Section: Air Bubblesmentioning

confidence: 99%

Recipes for the Derivation of Water Quality Parameters Using the High-Spatial-Resolution Data from Sensors on Board Sentinel-2A, Sentinel-2B, Landsat-5, Landsat-7, Landsat-8, and Landsat-9 Satellites

et al. 2023

View full text Add to dashboard Cite

Satellites have provided high-resolution ( < 100 m) water color (i.e., remote sensing reflectance) and thermal emission imagery of aquatic environments since the early 1980s; however, global operational water quality products based on these data are not readily available (e.g., temperature, chlorophyll- a , turbidity, and suspended particle matter). Currently, because of the postprocessing required, only users with expressive experience can exploit these data, limiting their utility. Here, we provide paths (recipes) for the nonspecialist to access and derive water quality products, along with examples of applications, from sensors on board Landsat-5, Landsat-7, Landsat-8, Landsat-9, Sentinel-2A, and Sentinel-2B. We emphasize that the only assured metric for success in product derivation and the assigning of uncertainties to them is via validation with in situ data. We hope that this contribution will motivate nonspecialists to use publicly available high-resolution satellite data to study new processes and monitor a variety of novel environments that have received little attention to date.

show abstract

Optical Microbubble Measurements in the North Sea

Cited by 11 publications

References 4 publications

The Freely-oscillating Bubble

The Freely-oscillating Bubble

Optical measurements of small deeply penetrating bubble populations generated by breaking waves in the Southern Ocean

Recipes for the Derivation of Water Quality Parameters Using the High-Spatial-Resolution Data from Sensors on Board Sentinel-2A, Sentinel-2B, Landsat-5, Landsat-7, Landsat-8, and Landsat-9 Satellites

Contact Info

Product

Resources

About